Differential material feeder for sewing machines of the supporting arm type



Oct. 25, 1938. EBERT 2,134,329

DIFFERENTIAL MATERIAL FEEDER FOR SEWING MACHINES OFTHE SUPPORTING ARM TYPE Filed Aug. 18, 1936 4 Shets-Sheet 1 Oct. 25, 1938. FEBERT 2,134,329

DIFFERENTIAL MATERIAL FEEDER FOR SEWING MACHINES OF THE SUPPORTING ARM TYPE Filed Aughl8, 1956 4 Sheets-Sheet 2 Fi g'fiZ.

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ZTzWwe v Oct. 25, 1938. F. EBERT 1 2,134,329

DIFFERENTIAL MATERIAL FEEDER FOR SEWING MACHINES OF THESUPPORTING ARMTYPE Filed Au 18, 1936' i 4 Shee ts-Sheet s I7 Skew 72k Fnz'fz 58k T Arz me 0611.25, 1938,. EBERT v 2 ,134,329v E DIFFERENTIAL MATERIAL FEEDER FOR SEWING MACHINES OF THE SUPPORTING ARM TYPE Filed Aug. 18, 1936 4 SheetsSheet 4 fwvenfof': PFIZEN as/Z Afforw ey v Patented Oct. 25, 1938 2,134,329, DIFFERENTIAL MATERIAL mam-m ron SEWING MACHINES ma Ebert, mam-ornament, Germany, I nsaignor to Mauser-Wake A.--G.', Obcrhdorfor'rnn sorronrmq .on-thc-Ncckar, Germany, a Joint-stock com i I v v I V i l i pany of Application I c This invention relates to mammal material feeder for sewing machines of the supporting arm.

feeder in the direction of the axis of the supporting 'The drive' in respect of the mainmaterial feeder is-located in the upright ofthe sewing machine frame and is transmitted to an intermediate drive which is arranged at a stable point of the supporting "arm near th'eupright of the frame of the sewing machine. This intermediate drive both actuates the element-that moves the main feederlongitudinally as wellas supplies the power for moving the differential feeder. The movement of these two feeders may be reguvarying the length-of stitch and for the differential operation, in such fashion that on the one hand the oscillations of the :comon element driving the two feeders and on the other hand the movements of the differential feeder may be varied separately. I

The invention relates to means for regulating the differential-feeder, such means" being characterized by the fact that the extent of; the differential effectmay be adjusted when the machine is running, so that a greater or smaller amount of material may be fed to the-needle dependent onthe particular material concemed and the desired form. a I

- 'operatedata very high speed, there is provided in accordance with the invention an externally operated lever, which serves to'vary the differential effect, on the shaft alreadycarrying the operating means for the differentialfeeder, the movements thereof. being transmittedto a link 1 engaging in direct fashion with the support for the differential feeder." Preferably the lever is": connected with a sleeve, which'isfitted over the shaft and by means of which the rotary movement of the lever is conveyed to a lever system thelsupmrtmg I ofthg -e m nia i r located within the supporting arm. The' sleeve 4 also serves as a. collar for the oscillatory frame and maybe readily adjusted or readjusted from the outside. At the other end the shaft is held. a

in the supporting arm by means of a; worm screw. The actuation of the setting Ilever results in an upward movement of "the link with the material.

greater difierential effect. The link encloses the, operating lever of the diflerential feeder infork like manner and is guided in a. segment of the 55 operating lever by means of a guide member,

August 18,1930, Germany September 20. 1935 5 omm f" (or. 112-209) V the sewing'machi est differential lated, and there are provided separate means for cording to the invention. feeder support, there thus being adJusted a other' arm of which lever isengascd by'ja' ccn-' sci-ur ne. 983th I w hich is enmi y cylindrica p n connecting I the ends of the fork} type in which theoperative forceacts on the tween two stops which are preferably in a segment of a cale bar'providedon the frameof e... Aspr d 'engas s .w th the v f stop, so that when the pedal or angle levergc'eases to emmed the original .extentl'ofthefeedink movement is adjusted automatically." .The reateffect 'is-flxed by ,the adlustable 1 lower stop; The'stops' consist of threaded bolts and are preferably. furnished with markingsjfor exact adjustmentjof thedifferential .eifech'jthese is markings-co-operating with the scale provided on:

the bar. The markings arelin theform of'grad-' nations on washers the threaded bolts; which are d d bymeans; nwo surfaces astdbe v secured against rotati semen, 01 We; 20 scale bar,'

The two screw stops also permitof the adjust: ment of a certain fixed differential effect without 1 actuation of the pedal or the'angle' lever, For this purpose the twoscrews should be so adjusted 25 that in the desired position of the setting lever they beanagainst 'the two sides thereof. ,The machine may accordingly then befemployed in the manner of the ordinary-dlflercntial feeder In adaptation to the constructionsetout in 1 the foregoing, which enables the machine to-be output by increasing thecircumfereritial velocity.

r A possible form of "embodiment" or; thein'venmm isillustrated in the a c m anying drawings, vmwmchiv H Fig. 1 is anelevational iview or the emf-and Fig. 2 r is. a vertical section along the. linQIL-II in Fig; linthe'plane of the shaft of theinter-w mediate. operating-means. f

, Fig.3 is a plan view of Fig-1,partly in section, Fig. L4 is a perspective view of the device ac- The differentialj feeder 'is driven. the* mainshaft mounted in'the frame 9 of the machine, which drives throughthe medium of an eccentric 6 a double lever 5 mounted on the shaft l ,-t he actuated externally of the machine.

outwardly at the one end and carries-a sleeve 39,

necting rod II, which actuates a rockinglever ll mounted to be rotatable on a transverse spindle or axle i2 which is furnished in the supporting arm Lin the vicinity of the upright I. The rocking lever' ll possesses an additionai arm It with which itformsa' U-shaped structure, to the arms of which there is pivoted a, fork-like frame II, which at the other end is detachably connected with a rod 20 carrying the main feeder 1. To adjust the length of the' pin. ,II of the connecting rod II is guided in a slot I in the lever I. There is also derived from the U-shaped lever H 'the drive in respect of the'diiferential feeder I, a third arm 23 provided on'the lever il transmitting the oscillatory movements by way of a connecting rod 2 4 to a support 2|,at the end of which the differential feeding means are located. d

'To adjust the diiferential effect on the part of the feeding means 3 whenthe machine is in operation the connecting rod '24 in the arm 23 is made to be adjustable by means capable of being For this purpose the transverse spindle- I! mounted in the supporting arm i is-extended towhichflthesetting lever- .40 acting onthe connecting rod, 24 is firmly secured. The connecting rod is adapted tooscillate around a stud of a clamping. sleeve i'lsecuredagain'st rotation by asetting collar 28. the inner side of the supporting arm I thereis also firmly secured on the "sleeve? II a lever ",which participates in the rotary movement transmitted to thesleeve 39 by ,the setting lever 40. The sleeve 39 serves at the same time as a collar forthe rock'in'g'lever II for the purpose of adjusting thelever-"system ll, ll, and in the longitudinal direction of the spindle il in order to avoid a clamping'eflect of these levers and the parts connected thereto. The collar 39 can be adjusted in an axial direction in order that the rocking lever ll shall'serve as a with an eye 36 in the connecting'rod 2l,'whereby thefpoiht of engagementof the connecting'rod I 24 with the slotted guide 28 of the arm 23 is varied by rocking the setting lever 40 and in this way a greater or smaller differential effect is caused on Pa Ofthe feeder a.

In'order to render possible a proper adjustfment of'the connecting rod at high speed of op- 65 eration' of 'the machine provision is made for a ready 'and frictionless guiding'of theend of the connecting rod in the'arm 23. Theconne'cting rod encloses the arm in forklike manner andisf held by a pin or abutment BI-which is I capable ofsliding 1r the guide 26. abutment is mounted on a cylindrical pin It which.

' connectsthe two endsof the fork.-

The settingleverfl is capable'of performing a rocking movement in a vertical plane and may be actuated either bymeans of a pedal (not shown) or bymeans of an angle lever -(also'notJ shown). A spring- 42 engaging with the lever 40 returns the latter into the initial position. The

1 to be able to fix exactly the extent of the differenf'tial effect these stopsare shiftable f on a scale' bar (Lwhich is secured to these'wing machine .frame 9 by meansof screws 44. The stops consist of threaded bolts 43;" screwed into nuts 50, 5|,

' so as to be incapable of variation.

.position'of-.the stops in relationto the scale I! provided on the'bar 48. To prevent rotation of the washers these and'also the nuts l0, II are furnished with cut faces, by means of which the parts in question are guided in the slot 49.

with thi'sarrangement any desired extent of the differential effect may be determined and fixed beforehand." The differential effect may be introduced in the desired extent during the operation of the machine by actuation of the pedal or theangle'ievenjwhereby the setting lever ll mo'ves'against the lower stop. After release of the setting i lever this returns automatically against the upper stop, so that there is again adjusted the original extent of movement. two screw stops, however, may also be provided in close proximity on either side of the setting lever, so that any; desired differentialeii'ect may be set *what mannerthe same is tobe performed, I declare that what I claim is:

The'

1. A differential feedingmechanism for sewing machines comprising a supporting'arm, main and auxiliary material feeders, means mounted onan axle for operating thensaid auxiliary feeder. a

support for: the said feeder,an externally operated lever for varying the differential efiect of the said auxiliary feeder, the said lever being amounted on the said axle, a lever system located within the said supporting arm, a sleeve on saidaxle for transmitting the rotary movement of the saidsexternally operated lever to the said lever system, and a linkco-operating with the said sleeve andengaging with the said support by means of a connecting rod, the said sleeve also 'actingas a collarefor the said lever system so that the latter may be exactly adjusted in relation to thesaidsupport.

2. A differential feeding mechanism for sewing.

machines comprising main and auxiliary material Yfeederameans mounted on an axle'for operating the said auxiliary feeder, asupport for the said.

auxiliary feeder, an externally operated lever; for

varyingthe differential eil'ect of the said feeder,

the saidlever being mounted on the axle of the said operating means, a slotted guide ongthe opercylindrical pin connecting the, ends of the fork,

and aguide member .on the said, pin forguiding the said link -in'the slot of the guide. v

. .3. A diflerential feedingmechanism for sewing machinescomprising main and auxiliary ma- .terial feeders,means for operating the saidauxiliary feeder, a support for the said feeder, an

externally operated lever for varying the differ- .ential e il'ect'of the said feeder', ascale bar,stops on thesaid bar limiting the extent of movement of thesaid lever, a'spring for drawing the said lever against one of the stops, and a link for V v transmitting the movements of the said lever and movement of the setting lever is limited by two stops which are made to be'acljustable.- In order rial feeders, means mounted on an axle for opersizing the said auxiliary feeder, a support for the said feeder, an externally-operated lever for varying; the diflerential efle'ct oi-the said feeder. the

said lever being mounted on the axle of the said operating means, a scale bar, threaded bolts constituting stops for limiting the extent of move-' ment of the said lever, the said stops having 15 said feeder. an externally operated lever for vary-,

ing the diflerential eflect of the ma ieeder, me 1 said lever being mounted on the axle of the saidoperating means, a scale bar having a slot therein, threaded bolts constituting stops'tor limiting the extent of movement of the said lever, the said stops having flattened faces to secure them against rotation in the said slot, washers on the i said stops having graduations adapted to cooperate with the said scale bar, a for drawing the said lever against one of the said stops, and a link for transmitting the movements of the said lever and engaging with the said support by means of a connecting rod.

FRITZ EBERT. 15 

